Height block



C. E. LLOYD HEIGHT BLOCK Sept. 29, 1942.

Filed Dec. 2, 1941 Patented Sept. 29, 1942 UNTED STATES OFFICE Application December 2, 1941, Serial No. 421,383 In Great Britain December 12, 1940 3 Claims.

This invention relates to measuring instruments and comprises a new or improved height block, and it has for its object a height block which is light in weight, which is constructed to maintain measuring accuracy and which can be placed adjacent a member having an irregular surface or having projections which would interfere with the convenient positioning of the block, A further object is to enable a height block to be built up to a variable height.

According to the present invention, a height block is constructed having a flat surface block or plate at the top and a flat surface block or plate at the bottom connected by a web or webs to give the required height and impart rigidity to the said top and bottom blocks and prevent distortion thereof, so that the top and bottom surfaces will be maintained flat and parallel. The webs also form an opening so that projections can pass therein to enable the block to be positioned close to the part to be gauged. The said top and bottom blocks are of different areas so that when the blocks are placed on one another to build up a larger height block, inset recesses can be formed to receive projections and enable the built-up block to lie close-in adjacent the Workf In order that the invention may be clearly understood and readily carried into effect, reference may be had to the accompanying drawing on which:

Figure 1 is a side elevation of two height blocks constructed according to this invention.

Figure 2 is a sectional plan view, the section being taken on line II-II of Figure l, and

Figure 3 is a perspective view of the lower height block shown by Figure 1.

Accordingly to a convenient embodiment of this invention, the height block l is formed as a close grained iron casting and comprises a shallow square block or surface plate 2 at the top and a square block or plate 3 at the bottom which are connected at or adjacent two opposite sides by webs or side walls 4. The square of the top block 2 is smaller than that of the bottom block 3 and the webs are channel shaped and incline inwardly and taper from the larger block 3 to the smaller block '2. The channel which faces outwardly has conveniently a flat bottom 5 and inclined sides or flanges 6, which pass angularly to the adjacent corners of the blocks. A Web l is also cast on each end of the height block connecting the roots of the channelled webs together and to the inner faces of the blocks. The inclined flanges 6 form diagonal stays on the inner sides of the surface plates and the webs l, connecting the roots of the channelled Webs, stay the surface plates between the diagonal stays whilst leaving a central opening through the height block. By thus constructing the height block, the surface plates or blocks at each end are stayed against distortion by the webs and the outer faces are maintained in true parallelism and in a nat condition. The height blocks are also light in weight.

A number of height blocks thus constructed and of diiferent heights are provided to form a set and an adjustable height block can be built up by placing one unit block on another. The openings in the blocks enable the composite height block to be positioned close to the work as any projection can pass into an opening. Again by placing the small end of one block on the small end of another block as shown by Figure 1, insets in the side of the built-up block are obtained by the reversely tapering blocks to evade any inconvenient projection on the article to be gauged. Again the blocks can be placed on one another off the centre to enable the top surface to be conveniently placed for the gauging operation, and in fact the set of blocks are capable of being arranged in a variety of ways to meet individual circumstances of the shape of the article to be gauged, whilst at the same time a block of considerable height can be obtained and extreme accuracy can be relied on.

I claim:

1. A height block formed as a casting comprising a flat surface plate at the top and a flat surface plate at the bottom, a channel shaped web at each opposite side connecting the top and bottom plates forming a space between the back of the channels and with the side flanges of the channels passing diagonally to the adjacent respective corners of the plates and cross webs connecting the backs of the channels, at the junction with the surface plates, with the inner faces of the surface plates.

2. A height block formed as a casting reducing in size from one end to the other comprising a flat surface plate at the top and a flat surface plate of larger area at the bottom, and an inclined wall at each opposite side connecting the plates and leaving a central opening through the height block and having stifening Webs extending down the wall and diagonally along the inner face of the surface plates, and cross webs connecting the backs of the walls, at the roots, with the inner faces of the surface plates.

3. A height block formed as a casting comprising a substantially rectangular fiat surface plate at the top and a substantially rectangular flat surface plate at the bottom and webs connecting the inner faces of the surface plates arranged diagonally of the height block and passing to the corners of the plates.

CHARLES EDWIN LLOYD. 

